dt-bindings: clock: add ID for eMMC for EN7581

Add ID for eMMC for EN7581. This is to control clock selection of eMMC
between 200MHz and 150MHz.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20250113231030.6735-4-ansuelsmth@gmail.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

Author: Ansuel

include/dt-bindings/clock/en7523-clk.h

@@ -12,4 +12,6 @@
 #define EN7523_CLK_CRYPTO	6
 #define EN7523_CLK_PCIE		7
 
+#define EN7581_CLK_EMMC		8
+
 #endif /* _DT_BINDINGS_CLOCK_AIROHA_EN7523_H_ */